Patents that aren't yet published aren't searchable unless you're a patent examiner. As an outside searcher, you're limited to issued patents and published applications (in addition to non-patent literature, e.g., everything on the internet).

No, you can't search all patents that were filed today. You have to wait until they are published.

At the time of filing you wont be able to search it, best way is to file a patent and do a weekly search with already designed keyword till 20 month you will eventually reach to cover all prior art till filing.